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Because more often than not (to be more blunt it's more like ALWAYS, in my experience) people like this with serious boundary issues have serious personality disorders, or are at least pretty far down that path, and you just can't deal with them like adults because in many ways they just aren't. They're like FIVE in a lot of ways and they need an authority figure to intervene (and often enough that doesn't work either). I've dealt with far too many five year olds in adult bodies in the last few years (working in an art school) and .... they don't listen and you can't reason with them. Rain on their parade and they get mean. So take it easy on this LW, this isn't an easy problem to deal with.